New insights on the control of dicamba-resistant kochia

Kochia is a highly invasive weed that is common in the Great
Plains, where it has developed resistance to multiple herbicides.
Now new dicamba-resistant strains are adding to grower worries.

In a study featured in the latest edition of the journal
Weed Technology, researchers explored two recently
discovered dicamba-resistant kochia populations found in fallow
fields near Hays, Kansas. Both were part of a
wheat-sorghum-fallow rotation.

Dose-response studies showed moderate to high levels of dicamba
resistance. One population was five- to eight-fold more
resistant than susceptible kochia plants, while another was
three- to five-fold more resistant.

To evaluate control options for dicamba-resistant kochia,
researchers compared the results achieved by spring and fall
applications of preemergence herbicide tank mixtures with
multiple sites of action. One mixture contained dicamba,
pendimethalin and sulfentrazone, while the other contained
metribuzin and sulfentrazone.

Though both spring and fall applications provided effective
control of dicamba-resistant kochia in fallow fields,
spring-applied herbicides provided better extended control. In
fact, spring applications reduced emergence by 85 to 95 percent
over three to four months.

"To control kochia and sustain the long-term utility of
dicamba, integrated weed management strategies are a must,"
says Vipan Kumar, Ph.D., of Kansas State University. "Applying
preemergence tank mixtures with multiple sites of action can be
an important part of any stewardship program, especially when
combined with tillage, cover crops and other weed management
techniques."

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